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    SubjectRe: kernel BUG at mm/rmap.c:480 in 2.6.10-rc3-bk7
    On Tue, Dec 14, 2004 at 11:26:48PM +0000, Hugh Dickins wrote:
    > On Tue, 14 Dec 2004, Greg KH wrote:
    > >
    > > So I finally try to get dri working on my laptop and I get the following
    > > kernel bug when killing X (the program gish was running at the time):
    > >
    > > kernel BUG at mm/rmap.c:480!
    > > EIP is at page_remove_rmap+0x32/0x40
    > > Process gish (pid: 10864, threadinfo=c8aea000 task=c7c2c040)
    > > [<c0141495>] zap_pte_range+0x135/0x290
    > >...
    > > [<c0145f41>] exit_mmap+0x71/0x140
    > > [<c01163c4>] mmput+0x24/0x80
    > > [<c011a756>] do_exit+0x146/0x370
    > >...
    > It's my BUG_ON(page_mapcount(page) < 0).
    > We've had about one report per month, over the last six months.
    > But this is the first citing "gish"; sometimes it's been "cc1".
    > I've given it a lot of thought, but I'm still mystified. The last
    > report turned out to be attributable to bad memory; but this BUG_ON
    > is too persistent and specific to be put down to that in all cases.

    The killing X smells like it could be related to drm or other kernel X
    drivers. Could you try not to load the drm/agp stuff and see if it goes
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